Calendar Shortcodes currently display nothing! HELP!

I recently discovered that neither the shortcodes or their earlier versions work anymore, and now my client’s calendar no longer displays their upcoming shows:

Upcoming Shows

[gigpress_shows scope=upcoming]

[gigpress_upcoming]

Previous Shows

[gigpress_shows scope=past]

[gigpress_archive]

just displays the two headings, but no shows.

I have tried using Plugin Detective, and it does not seem to be able to identify any issues. I am using the latest version of Gigpress 2.3.22, and have tried it with the 2018 WordPress Theme. I have no idea what is going on. Is there something that has changed with Gigpress? Help, please?

The page I need help with: [log in to see the link]